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  Hydrogen frosting scenarios with the ASDEX upgrade in-vessel cryo pump

Streibl, B., Berger, N., Brendel, U., Härtl, T., Rohde, V., & Schall, G. (2003). Hydrogen frosting scenarios with the ASDEX upgrade in-vessel cryo pump. Fusion Engineering and Design, 69(1-4), 103-108. doi:10.1016/S0920-3796(03)00265-5.

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 Creators:
Streibl, B.1, Author              
Berger, N.1, Author              
Brendel, U.1, Author              
Härtl, T.2, Author              
Rohde, V.1, Author              
Schall, G.1, Author              
Affiliations:
1Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
2Tokamak Scenario Development (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856321              

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Free keywords: 22nd Symposium on Fusion Technology (SOFT 2002), Helsinki, 2002-09-09 to 2002-09-13
 Abstract: The ASDEX upgrade vacuum vessel is equipped with 14 turbo molecular pumps (TMPs) and a cryo pump (CP). The CP is cooled with boiling helium (He). To obtain similar conditions with the CP for hydrogen (H₂) and deuterium (D₂) pumping a lower helium panel temperature (THP) is required in the case of H₂. This is achieved by reducing the He boiling pressure (pb) and thus the He boiling temperature (Tb) via pump down of the He cryostat. The requirements are predicted by computations and verified experimentally for this case. By raising the cryostat pressure above ambient, the prediction of the H₂ end pressure (peH₂) of the CP could be compared with measurements in the range 5×10⁻⁷ < peH₂ (mbar) < 5×10⁻⁴. The beneficial effect of argon frosting for helium pumping is only shown experimentally.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Fusion Engineering and Design
  Alternative Title : Fusion Eng. Des.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier B.V. All rights reserved
Pages: - Volume / Issue: 69 (1-4) Sequence Number: - Start / End Page: 103 - 108 Identifier: -